Customer Concentration Before a Sale: Measure the Exposure

Calculate the share before judging the risk

Use customer revenue divided by total revenue for the same entity scope and period. Identify related accounts that depend on the same purchasing decision. Keep an anonymized ranking for early discussions and reconcile the underlying customer totals to the sales ledger. Review the concentration of receivables separately: current exposure can differ from annual revenue share.

Show annual and recent comparable periods so a one-time order does not become a permanent assumption. Define credits, returns, acquisitions and customer grouping consistently. SEC issuer KPI guidance provides a reference for explicit definitions and calculation changes; it does not impose a private-sale customer concentration cutoff.

Stress-test contribution rather than inventing a probability

Original hypothetical: annual revenue is $1 million, variable costs are $500,000 and fixed operating costs are $300,000, producing $200,000 operating earnings on this simplified basis. A customer supplies $400,000 revenue and $250,000 of the variable costs. Losing all that business with those costs fully avoidable reduces earnings by $150,000 to $50,000.

The revenue loss is 40%; the earnings loss is 75%. That does not predict loss probability or sale value. If labor or purchasing commitments cannot be removed, the earnings effect is worse. Model notice periods, collection exposure and the time required to replace demand rather than treating an arbitrary probability as a price adjustment.

Check the denominator in a diversification plan

Suppose the same $400,000 customer stays unchanged within $1 million total revenue. To reduce its share to 25% solely through new sales, total revenue must reach $1.6 million: $400,000 divided by 25%. That requires $600,000 additional revenue, not $150,000. This is a hypothetical arithmetic target, not a recommended safe percentage.

Budget the capacity, working capital and acquisition costs required to deliver that growth. New low-margin orders may change the concentration percentage without improving earnings or cash resilience. Track actual collections and profitability rather than celebrating a denominator increase alone.

Review protections without overstating them

Examine each material contract’s term, termination rights, assignment or change-of-control conditions, pricing and remaining obligations with counsel. A multi-year heading does not establish that a customer cannot leave or that the contract transfers on sale. Record who owns the relationship and whether the customer depends on the departing owner.

For competitor diligence, customer-level pricing and strategy can require staged disclosure and clean-team safeguards under FTC guidance.

Provide permitted evidence through the agreed process. A contract extension or diversification project may address identified risks, but neither justifies a guaranteed 10–15% premium or a mechanical multiple adjustment.